check all checkboxes from an image

Hi

I need to check all the list of checkboxes in the aplication.

But i need it from an image and not from another checkbox

If i do use a checkbox to call the checkall function it works

how can i make it work for an image ?

<img src=”img/check.gif” onClick=”checkAll()” name=”checkAll()”>

<input type=”checkbox” name=checkall onClick=”checkAll()”>

function CheckAll() {
var val;
val = document.frm.checkall.checked;
dml = document.frm;
len = dml.elements.length;
var i=0;
for( i=0 ; i<len ; i++) {
dml.elements[i].checked=val;
}
}

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